421446 Site: sell downloadable files

We expect to post in the next weeks a large project. It's about the creation of a site to sell downloadable files. Owners of the files must be able to register, upload files, and add characteristics/description for the files. Normal users must be able to register, maintain profile information, search files, buy files and - after succesfull payment - download files. Site will include extended search facilities, administrative functions and many more. The site must be able to handle high load and probably we want it to run on Amazon Elastic Compute Cloud services. Of course, we will post a detailed description for this project. Now, we would like to make a first shortlist of potential programmers. If you are interested, please PM us with examples of sites with comparable functionality you created in the past, and please also mention if you have any experience with Amazon EC2 ! thanks!